What is the difference between :while and :when in clojure?

Question

I\'m studying clojure but not quite clear on the difference between the :while and :when test:

=> (for [x [1 2 3] y [1 2 3] :while          


        

Answer 1

:when prevents any inner 'for' bindings or its body expression from being evaluated for that one iteration, acting like the 'filter' function.

:while halts this binding from proceeding any more, acting more like 'take-while'